(Cat? OR feline) AND NOT dog?
Cat? W/5 behavior
(Cat? OR feline) AND traits
Cat AND charact*

This guide provides a more detailed description of the syntax that is supported along with examples.

This search box also supports the look-up of an IP.com Digital Signature (also referred to as Fingerprint); enter the 72-, 48-, or 32-character code to retrieve details of the associated file or submission.

Concept Search - What can I type?

For a concept search, you can enter phrases, sentences, or full paragraphs in English. For example, copy and paste the abstract of a patent application or paragraphs from an article.

Concept search eliminates the need for complex Boolean syntax to inform retrieval. Our Semantic Gist engine uses advanced cognitive semantic analysis to extract the meaning of data. This reduces the chances of missing valuable information, that may result from traditional keyword searching.

Correction of E Beam Deflection Patterns

Publishing Venue

IBM

Related People

Ryan, PM: AUTHOR

Abstract

This disclosure describes digital logic with which adjustments or corrections to the specified path of a physical object, such as an electron beam, may be defined and controlled despite systematic errors in the scanning mechanism. It represents an improvement over the correction technique described in U. S. Patent 3,644,700 and works in conjunction with digital hardware described in U. S. Patent 3,866,013.

Country

United States

Language

English (United States)

This text was extracted from a PDF file.

At least one non-text object (such as an image or picture) has been suppressed.

This is the abbreviated version, containing approximately
53% of the total text.

Page 1 of 3

Correction of E Beam Deflection Patterns

This disclosure describes digital logic with which adjustments or corrections
to the specified path of a physical object, such as an electron beam, may be
defined and controlled despite systematic errors in the scanning mechanism. It
represents an improvement over the correction technique described in U. S.
Patent 3,644,700 and works in conjunction with digital hardware described in U. S. Patent 3,866,013.

Each portion of a cyclic deflection pattern (e.g., all
forward-going scans) contains a measurable positional error as a
function of beam position. This error may be described by two error
surfaces (one for error in X, one for error in Y) over the XY plane.

Once these error surfaces are known (through techniques described in U. S. Patent 3,644,700), they may be separated into errors of initial
position, at the beginning of each scan, and of speed, across each
scan line.

Referring to Fig. 1, piecewise-linear correction to starting position is
established by setting up a "running value" register and an "Increment" register.
Each time a position value is needed (at the beginning of each line), the running
value is gated to an output register, the increment is added to it, and the sum re-
stored in the running value register. Periodically, new values are set into the
increment register, resulting in a piecewise-linear correction of starting position.

Piecewise-linear correction of position error along each scan is achieved by
piecewise constant adjustments of speed along each scan. This is accomplished
with the circuit in Fig. 2.

At a sequence of points along each scan, a "correction sync is received from
the pattern control section. This sync, together with YLSB, the LSB of the li...